Which of the following techniques is/are used for the soil fertility evaluation?
Correct answer: C. All of these
- A. Soil testing
- B. Plant tissue testing
- C. All of these
- D. Aspergillus niger test
Explanation
Soil testing measures available nutrients directly, plant-tissue testing reveals the nutrients actually absorbed, and the Aspergillus niger test estimates nutrient availability biologically. Therefore, all three can contribute to soil-fertility evaluation.
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